Final answer:
The nurse should prioritize encouraging ambulation if a client shows signs of deep-vein thrombosis.
Step-by-step explanation:
The nurse should prioritize encouraging ambulation if a client shows signs of deep-vein thrombosis. Ambulation helps to improve blood flow and prevent blood clots by activating the calf muscles, which act as a pump to push blood back up to the heart. Walking and leg exercises can help reduce the risk of DVT formation and improve circulation.